CVE-2023-29400 Improper handling of empty HTML attributes in html/template
Attackers can inject arbitrary HTML attributes via empty inputs in unquoted template actions, potentially leading to XSS or code execution in Go applications.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2023-29400?
CVE-2023-29400 is a high-severity cross-site scripting vulnerability in Golang Go, published on 11 May 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Templates containing actions in unquoted HTML attributes (e.g. "attr={{.}}") executed with empty input can result in output with unexpected results when parsed due to HTML normalization rules. This may allow injection of arbitrary attributes into tags.
Which versions are affected by CVE-2023-29400?
2 open source packages ship an affected version, including golang and stdlib. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
golang Bitnami | All versions | 1.19.9, 1.20.4 |
stdlib Go | All versions | 1.19.9, 1.20.4 |
Products include Golang Go.
How do I fix CVE-2023-29400?
Upgrade golang to a fixed version for your release line: 1.19.9 or 1.20.4.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2023-29400 being exploited?
There is no known exploitation of CVE-2023-29400 in the wild and no public exploit code.
Other vulnerabilities in Golang Go
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- CVE-2026-27143 Missing bound checks can lead to memory corruption in safe Go in cmd/compile
- CVE-2024-24790 Unexpected behavior from Is methods for IPv4-mapped IPv6 addresses in net/netip
- CVE-2023-39320 Arbitrary code execution via go.mod toolchain directive in cmd/go
- CVE-2023-24540 Improper handling of JavaScript whitespace in html/template
Sources
Also known as AZL-26615, AZL-26627, AZL-34749, AZL-37470, AZL-37500, AZL-79022 and 6 more.